f(x)=|5x-10|+3x
f(x)=(2x-3)^2+(x-4)^2-4x^2+10x-16
pomocy:(((((((((
f(x)=5x+3x-10
5x+3x=-10
8x=-10/8
x=-10/8
x=-1 2/10
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f(x)=5x+3x-10
5x+3x=-10
8x=-10/8
x=-10/8
x=-1 2/10